a very loud train whistle has an acoustic power output of 100 W. if the sound energy spreads our spherically, what is the intensity level in dB at a distance of 100 meters from the train? I0=10^(-12)
the answer is 200 m but how do i get it?
3 answers
How can the intentity level be in meters?
oooh...sorry I meant to write 89.0 dB
The sound is spread over an area of 4PI*100^2 in m^2
The intensity then is in watts/m^2=
100/(4PIE4)=7.96E-4 watts/m^2
db= 10 log (7.96E-4 /10^-12)
The intensity then is in watts/m^2=
100/(4PIE4)=7.96E-4 watts/m^2
db= 10 log (7.96E-4 /10^-12)